package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;

/**
 * Description:C端购物车业务层相关接口实现类
 */
@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetMealMapper setMealMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    @Transactional
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //查询购物车是否存在一样的菜品
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> carts = shoppingCartMapper.list(shoppingCart);

        //如果存在则把购物车存在的菜品加1
        if (carts != null && carts.size() > 0) {
            ShoppingCart cart = carts.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        } else {
            //判断本次添加的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            Long setmealId = shoppingCartDTO.getSetmealId();

            if (dishId != null) {//添加的是菜品
                //根据菜品ID查询出来
                Dish dish = dishMapper.getDishById(dishId);

                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            } else {//添加的是套餐
                //根据菜品ID查询出来
                Setmeal setmeal = setMealMapper.getById(setmealId);

                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            //如果不存在则插入购物车
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     *
     * @return
     */
    public List<ShoppingCart> lookShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 删除购物车
     *
     * @return
     */
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.cleanShoppingCart(userId);
    }

    /**
     * 删除购物车里面的一个菜品或套餐
     *
     * @param shoppingCartDTO
     */
    public void decreaseOne(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list != null && list.size() > 0) {
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            if (number == 1) {//当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteOne(shoppingCart.getId());

            } else {//当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
